Earnings Per Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net Income Attributable to Graphic Packaging Holding Company					$ 41.5	$ 53.0	$ (40.0)	$ 35.2	$ 230.1	$ 89.7	$ 146.6
Weighted Average Shares:
Basic (in shares)									329.5	328.6	347.3
Dilutive effect of RSUs (in shares)									1.2	1.9	2.4
Diluted (in shares)									330.7	330.5	349.7
Earnings Per Share - Basic (in dollars per share)	$ 0.17	$ 0.18	$ 0.17	$ 0.17	$ 0.13	$ 0.16	$ (0.12)	$ 0.11	$ 0.70	$ 0.27	$ 0.42
Earnings Per Share - Diluted (in dollars per share)	$ 0.17	$ 0.18	$ 0.17	$ 0.17	$ 0.13	$ 0.16	$ (0.12)	$ 0.11	$ 0.70	$ 0.27	$ 0.42